Electric lamp.



F. G. KEYES.

ELECTRIC LAMP.

APPLICATION FILED MAR-6,1914.

1 ,lwfi fififin Patented Nov, 28,1916.

mymmwm His A Tram/5Y3- FREDERICK G, KEYES, OF EAST ORANGE, NEW JERSEY, ASSIGNOE T COOPER HEWITT ELECTRIC COMPANY, OF HOBOKEN. NEW JERSEY, A CORPORATION OF NEW JERSEY.

ELECTRIC LAMP.

I ,QOhdiiShh Specification of Letters Eatent.

Application filed March 6, 1914. Serial No. erases.

To all whom it may concern:

Be it known that I, FREDERICK Gr. Knifes, a citizen of the United States, and resident of East Orange, county of Essex, State of b New Jersey, have invented certain new and Ill lid

useful Improvements in Electric Lamps, of

which the following is a specification.

In certain applications numbered 8ll,0;02 and 811,003, both filed on the 8th day of January 1914, I illustrate and disclose tungst'en lamps in which filaments of tungsten capable of carrying current of from 3 to amperes constitute the illuminants, whereby the filaments are less fragile than those in ordinary commercial use and whereby also, on account of the lower applied potential, the lamps escape certain of the limitations imposed by the usual commercial supply voltages. In the application bearing the lower serial number the filament is wound into spiral form and has its terminals connected through tubular seals to the outside circuit. In the other application the coiled or spiral filament is supported in such a manner as to form. angles which may result in a star shape or some other shape adapted to concentrate the light given ed by the filament when the lamp is in operation.

In my present invention I make use in certain cases of a crimped ribbon filament,

thereby providing for the dispersion from form a part of this specification Figure 1- shows a section of crimped metal ribbon; Fig. 2 is a vertical section of one of my lamps, a portion of which is shown in full lines; Fig. 3 is a bottom view of the filament shown; in'l ig. 2; Figs. 4 and .5 illustrate difierent arrangements of a ribbon and Fig. 6 is a detail VlGW,

In the drawings, 1 is a globe for one of my lamps and 2 is a tungsten filament, here shown in the form of a crimped ribbon, located approximately at the center of the globe. The filament is attached at its ends by means of loops, 5, 5, of tungsten wire to lead wires 3, 3, of nickel-steel. The tungsten wire may be replaced by a wire of molybdenum, tantalum, or other refractory metal, and a convenient mode of attachment is to form a loop or bend in the metal Wire,

bring it up against the side of the ribbon at the ends thereof and then crimp the ribbon down upon the wire. Similar rods are shown at l, a, the same being provided with tip portions of tungsten or other refractory metal in the form of wire which are sealed to nickel-steel rods and may be bent around at their outer ends so as to surround completely or partially the central portion of the tungsten ribbon and support the same along its middle. The leads 3, 3, and the rod, l, pass through a disk or diaphragm, 6, of aluminum lyin within a tubular extension, 7, of the glo e 1 and being arranged Patented new, as, rate;

just above a shoulder, 8, near the bottom of said extension. T he object of the diaphragm 6 is to shut off from the tubular extension and from the lamp seals, presently to be destituting the main conducting portions of the lamp seals. On the outer ends of the tubes 10, 10, are placed iron caps 11, 11, which are welded to the tubes l0, l0, and the rods 9, 9, by means of an oxyacetylene flame. The external leads may be copper wires 13, 13, fused or soldered to the caps 11, 11, as shown.

It will be observed that the seals are made within a reentrant portion of the extension 7, whereby the danger of fracture from mechanical causes is reduced. The tubes 10, 10., are sealed within the said reentrant portions. The entire interior of the lamp is thus sealed 0d from exposure to the external air and a structure is provided which admits of the safe and continuous application thereto of currents ranging from 3 to 50 amperes.

In this way lamps of exceedingly high candle power are obtainable without unduly shortenin the life of the lamps.

It will observed that a rod, 60, of glass Hill is secured to the bottom of the reentrant portion and after being carried down to a are illustrated in Fig. 6. An opening shaped somewhat like a key-hole is made in point near the bottom of the extension 7 is? the diaphragm as shown at 65, and the wider provided with shoulders, 61 and 62, which hold the diaphragm, 6, in place. The central portion of the part, 60, may be hollow to receive material for absorbin water 'vapor or oxygen from the inside 0 the extension, 7, although these features do not necessarily form a part of the present invention and the details are omitted.

The mode of connection between one of the inner leads 3, and the aluminum diaphragm 6 is illustrated in Fig. 2. An opening being made in the diaphragm at the proper point "thetube of copper and iron,

surroundedby a tube 14 of quartz is passed through the diaphragm and the entire inner space is then packed with a suitable cement, 15, such as might be formed by the mixture of ground silica and sodium silicate. This prevents the contact of the inner leads with the aluminum diaphragm and thus obviates the danger of short circuiting between said leads. By similar construction the anchor rod 4 is supported in the diaphragm and in sulated' therefrom and from theinner leads 3, 3.

Ihe means for inserting the diaphragm 6 into place between the shoulders 61 and 62 62 and the diaphragm part of the opening is large enough to pass over the shoulder 62. As soon as it has reached this point, the diaphragm is pushed along so that the narrow portion of the opening 65, surrounds a reduced part 64, of the-rod 60. In this position the disk is retained firmly between the shoulders 61 and is properly placed within the extension I.

I claim as my invention:

1. In a tungsten lamp, a luminant of tungsten in the form of a crimped ribbon and leads connected with the terminals of said ribbon.

2. In a tungsten lamp, a luminant of tungsten in the form of a crimped ribbon having its ends brought into proximity to each other and forming a filament having angles at intervals and leads connected with the terminals of the ribbon.

Signed at New York, in the county of New York and State of New York, this 3rd day of March, A. D. 1914.

' FREDERICK G. KEYES.

Witnesses:

THos. H. BROWN, HAROLD B. WOODNALL. 

